Many devices (GPS, Instrument Data, AIS Receiver, Satellite Phone, Pactor Modem) connect to your onboard computer via a legacy-standard RS-232, or COM port.
As the number of devices you'd like to connect multiplies, it's not uncommon to run out of available serial ports. In fact, many newer laptop computers are designed without any legacy COM ports at all. One solution is a USB-Serial adapter, to convert a single USB port on your computer to one or more serial ports. We carry the SeaLevel line of adapters recommended by Nobeltec, MaxSea and others.
You can purchase these products with confidence -- all SeaLevel adapters carry a lifetime warranty from SeaLevel Systems.